Existense of Replicating Sporocysts in the Development Cycle of Schistosoma haematobium

Kechemir, N; Thèron, André

doi:10.2307/3280427

Cited by 14 publications

(8 citation statements)

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“…2). Although this again may be a consequence of sample size and the fact that far fewer snails were found shedding S. haematobium and/or the hybrids, it might also reflect biological species differences during intramolluscan development, such as variation in sporocystogenesis regulatory mechanisms [77][78][79].…”

Section: Discussionmentioning

confidence: 99%

Interactions between Schistosoma haematobium group species and their Bulinus spp. intermediate hosts along the Niger River Valley

et al. 2020

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Background: Urogenital schistosomiasis, caused by infection with Schistosoma haematobium, is endemic in Niger but complicated by the presence of Schistosoma bovis, Schistosoma curassoni and S. haematobium group hybrids along with various Bulinus snail intermediate host species. Establishing the schistosomes and snails involved in transmission aids disease surveillance whilst providing insights into snail-schistosome interactions/compatibilities and biology. Methods: Infected Bulinus spp. were collected from 16 villages north and south of the Niamey region, Niger, between 2011 and 2015. From each Bulinus spp., 20-52 cercariae shed were analysed using microsatellite markers and a subset identified using the mitochondrial (mt) cox1 and nuclear ITS1 + 2 and 18S DNA regions. Infected Bulinus spp. were identified using both morphological and molecular analysis (partial mt cox1 region). Results: A total of 87 infected Bulinus from 24 sites were found, 29 were molecularly confirmed as B. truncatus, three as B. forskalii and four as B. globosus. The remaining samples were morphologically identified as B. truncatus (n = 49) and B. forskalii (n = 2). The microsatellite analysis of 1124 cercariae revealed 186 cercarial multilocus genotypes (MLGs). Identical cercarial genotypes were frequently (60%) identified from the same snail (clonal populations from a single miracidia); however, several (40%) of the snails had cercariae of different genotypes (2-10 MLG's) indicating multiple miracidial infections. Fifty-seven of the B. truncatus and all of the B. forskalii and B. globosus were shedding the Bovid schistosome S. bovis. The other B. truncatus were shedding the human schistosomes, S. haematobium (n = 6) and the S. haematobium group hybrids (n = 13). Two B. truncatus had co-infections with S. haematobium and S. haematobium group hybrids whilst no co-infections with S. bovis were observed. Conclusions: This study has advanced our understanding of human and bovid schistosomiasis transmission in the Niger River Valley region. Human Schistosoma species/forms (S. haematobium and S. haematobium hybrids) were found transmitted only in five villages whereas those causing veterinary schistosomiasis (S. bovis), were found in most villages. Bulinus truncatus was most abundant, transmitting all Schistosoma species, while the less abundant B. forskalii

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Section: Discussionmentioning

confidence: 99%

Interactions between Schistosoma haematobium group species and their Bulinus spp. intermediate hosts along the Niger River Valley

et al. 2020

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“…Detailed studies on S. mansoni in Biomphalaria glabrata (THERON, 1981a, b) where cercarial production was monitored continuously, have shown the presence of regular peaks and troughs in the levels of daily cercarial output reflecting the cycles of cercarial production from primary daughter sporocysts, combined with their periodic replication to produce further generations of sporocysts. The existence of replicating daughter sporocysts has also been shown in 5. haematobium (KECHEMIR & THERON, 1980) and histological examination over the first 80 days of infection in B. obtusispira suggest that, in this case, sporocystogenesis occurs in the early stages, allowing a more rapid build up in cercarial emission than in the case of S. mansoni (JOURDANE, 1983).…”

Section: Introductionmentioning

confidence: 99%

The cercarial output from three Nigerian bulinids infected with two strains of Schistosoma haematobium

Fryer

Probert

1988

J. Helminthol.

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The daily cercarial output of two Nigerian strains of Schistosoma haematobium in sympatric Bulinus truncatus, B. globosus and B. senegalensis was measured at weekly intervals from the start of emission to the snails' death. In all cases cercariae were released throughout the life of the host, with no cases of “self cure”. Patterns of output through the course of infections in B. truncatus and B. senegalensis were similar to those reported for S. haematobium by other workers, with daily production of cercariae rising to a peak within a few weeks of the onset of shedding, then declining until the host's death. In the longer lived B. globosus production was significantly higher, but declined to very low levels after the initial peak; in some individuals cercarial output remained very low, while others showed a second period of high cercarial emission. The relative compatibility of each host-parasite combination is discussed.

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“…In a recent study we showed that the larval development of Schistosoma rodhaini in Biomphalaria glabrata (THERON & TOUASSEM, 1989) follows an original pattern, different from those known in S. mansoni , S. haematobium (KECHEMIR & THERON, 1980) and S. bovis (TOUASSEM & THERON, 1986).…”

Section: Introductionmentioning

confidence: 75%

Schistosoma rodhaini: dynamics and cercarial production for mono- and pluri-miracidial infections of Biomphalaria glabrata

Touassem

Thèron

1989

J. Helminthol.

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No significant difference in cercarial production was noted when Biomphalaria glabrata from Brazil were exposed to one or several miracidia of Schistosoma rodhaini from Burundi, even though the dynamics seemed different. The minor differences can be explained by the intramolluscal larval development of this parasite characterized by the production of a high number of daughter sporocysts over a long period.

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Existense of Replicating Sporocysts in the Development Cycle of Schistosoma haematobium

Cited by 14 publications

References 0 publications

Interactions between Schistosoma haematobium group species and their Bulinus spp. intermediate hosts along the Niger River Valley

Interactions between Schistosoma haematobium group species and their Bulinus spp. intermediate hosts along the Niger River Valley

The cercarial output from three Nigerian bulinids infected with two strains of Schistosoma haematobium

Schistosoma rodhaini: dynamics and cercarial production for mono- and pluri-miracidial infections of Biomphalaria glabrata

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